Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 207 



Thallus et hypothallus indistinctus. Apothecia vulgo 

 sat crebra, verrucas formantia hemisphaericas, nigricantes, 

 nudas, vulgo opacas. Perithecium fusconigrum, dimidiatum, 

 lat. circ. 0.28— 0.5 mm, margine ostiolari haud prominente, 

 ostiolo minutissimo. Asci fusiformi-ventricosi, membrana 

 tota sat tenui. Paraphyses parcissimae, sat obsoletae. Sporae 

 tristichae polystichaeve, ovoideo-oblongae, 1-septatae, long. 

 0.015—0.020, crass. O.004— O.007 mm, loculo inferiore vulgo paullo 

 longiore, membrana modice incrassata. 



Distr. Ad corticem Betulae et raro Sorbi crescit, 

 nee sit rara, sed cum D. fallace et D. punctiformi commixta. 

 In herbariis tantum e locis sequentibus adest. Helsingforsia 

 (Nyl.). Ostrobotnia bor.: Alkkula (Edvin Nylander). Lapponia 

 Kemensis: Muonioniska (J. P. Norrlin, „ad truncos et ramos 

 Betulae et Sorbi haud rara in regione Coniferarum" secun- 

 dum Norrl. 1. c). Lapponia Inarensis: In regione Coniferarum 

 jugi Suoloselka (Vain.). 



Nucleus jodo non reagens, metaplasmate ascorum rubescente. 

 Paraphyses ascorum longitudine aut breviores, saepe long. O.020 

 — O.015 mm, furcatae aut irregulariter parce ramosae aut parce 

 ramoso-connexae (in KHO visae). Periphyses parcae brevesque. 

 Asci long. 0.058 — O.oto, crass. 0. 015— 0. 020 mm, apicem versus 

 membrana interdum magis incrassata. Sporae 8:nae, decolores, 

 strato gelatinoso tenui indutae aut membrana tota gelatinoso- 

 incrassata. Observante Nyl. „spermatia" (conidia) long. O.0045, 

 crass. O.0005 mm (V. epidermidis Nyl. Lich. Paris p. 126), at Nyl. 

 hanc speciem haud bene distinxit. Gonidia desunt. 



8. D. antecellens (Nyl.) Vain. 



Verrucaria antecellens Nyl. Fl. 1866 p. 86, Obs. Lich. Pyr. (Fl. 

 1873) p. 41, Lich. Pyr. Orient. (1891) p. 67; Norrl. Ber. Torn. Lappm. 

 (1873) p. 343. Verrucaria epidermidis *V. antecellens Hue Addend. II 

 (1888) p. 300. Lichen stigmatellus Sm. Eng. Bot. (1808) t. 1891, secundum 

 A. Sm. Mon. Brit. Lich. p. 320 (haud Ach. Lich. Suec. Prodr., 1798, p. 

 15). Arthopyrenia stigmatella A. Sm. 1. c. (1911) p. 320. 



Thallus macula albida pallidave indicatus. Apothecia 

 sat crebra, verrucas formantia hemisphaericas, nigricantes, 

 opacas. Perithecium fusconigrum, dimidiatum, lat. O.230 — O.250 

 mm, epidermide substrati obductum, margine ostiolari haud 



